The box is the same as the slider control.It represents a volume. Click it to change the volume.
The circle represents an angle with the volume control of left. Click it to change the angle.
The power which affects all particles. Specify the volume and angle. You can change after dropping particles.
The gravity affects the particles by same angle. The angle control represents the angle of it.
The gravity affects the particles from the center of the picture circularly. The angle control represents the angle of it when being particle at the upper.
Specify the upper limit of the slider of the general gravity.
regulate the speed of all particles.
You can change after dropping particles.